{"id":3008,"date":"2019-08-31T11:11:14","date_gmt":"2019-08-31T11:11:14","guid":{"rendered":"https:\/\/www.testpreptraining.com\/tutorial\/?page_id=3008"},"modified":"2020-05-01T11:08:57","modified_gmt":"2020-05-01T11:08:57","slug":"cloudwatch-alarms-2","status":"publish","type":"page","link":"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/cloudwatch-alarms-2\/","title":{"rendered":"Understanding CloudWatch Alarms"},"content":{"rendered":"\n<ul class=\"wp-block-list\"><li>Watches a single metric over a specified time period, and performs specified actions,<\/li><li>It initiates actions on behalf.<\/li><li>An alarm can result in taking action on basis of metric value against a threshold over time period.<\/li><li>Action can be notification to SNS or Auto Scaling policy.<\/li><li>Can add alarms to dashboards.<\/li><li>Actions only for sustained state changes only.<\/li><li>Always select a period&nbsp; greater or equal to the frequency of the metric to be monitored.<\/li><li>Maximum limit to create 5000 alarms\/Region in a AWS account.<\/li><li>To create or update an alarm, use PutMetricAlarm API action<\/li><li>Alarm names must contain only ASCII characters.<\/li><li>list currently configured alarms, by DescribeAlarms (mon-describe-alarms).<\/li><li>Disable or enable alarms by DisableAlarmActions and EnableAlarmActions<\/li><li>Test alarm by setting it to any state using SetAlarmState (mon-set-alarm-state).<\/li><li>View alarm&#8217;s history using DescribeAlarmHistory (mon-describe-alarm-history).<\/li><li>CloudWatch saves alarm history for two weeks.<\/li><li>The value of evaluation periods number for alarm multiplied by evaluation period length, should be less than one day.<\/li><li>Following permissions are required to create or change a Cloudwatch alarm\n<ul>\n<li>For alarms with EC2 actions\n<ul>\n<li>iam:CreateServiceLinkedRole<\/li>\n<\/ul>\n<ul>\n<li>iam:GetPolicy<\/li>\n<\/ul>\n<ul>\n<li>iam:GetPolicyVersion<\/li>\n<\/ul>\n<ul>\n<li>iam:GetRole<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>For alarms on EC2 instance status metrics\n<ul>\n<li>ec2:DescribeInstanceStatus<\/li>\n<\/ul>\n<ul>\n<li>ec2:DescribeInstances<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>For alarms with stop actions\n<ul>\n<li>ec2:StopInstances<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>For alarms with terminate actions\n<ul>\n<li>ec2:TerminateInstances<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>No specific permissions are needed for alarms with recover actions.<\/li>\n<\/ul>\n<\/li><\/ul>\n\n\n\n<p><strong>CloudWatch Monitoring<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Cloudwatch can be used to monitor\n<ul>\n<li>EC2 instances<\/li>\n<\/ul>\n<ul>\n<li>Autoscaling Groups<\/li>\n<\/ul>\n<ul>\n<li>ELBs<\/li>\n<\/ul>\n<ul>\n<li>Route53 Health Checks<\/li>\n<\/ul>\n<ul>\n<li>EBS Volumes<\/li>\n<\/ul>\n<ul>\n<li>Storage Gateways<\/li>\n<\/ul>\n<ul>\n<li>CloudFront<\/li>\n<\/ul>\n<ul>\n<li>DynamoDB<\/li>\n<\/ul>\n<ul>\n<li>Other AWS services<\/li>\n<\/ul>\n<ul>\n<li>logs generated by applications and services.<\/li>\n<\/ul>\n<\/li><li>EC2 will by default monitor instances @5 minute intervals<\/li><li>EC2 instances can monitor instances @1 minute intervals if the &#8216;detailed monitoring&#8217; option is set on the instance<\/li><li>CloudWatch monitors following, by default\n<ul>\n<li>CPU<\/li>\n<\/ul>\n<ul>\n<li>Network<\/li>\n<\/ul>\n<ul>\n<li>Disk<\/li>\n<\/ul>\n<ul>\n<li>Status Checks<\/li>\n<\/ul>\n<\/li><li>RAM utilization metric\n<ul>\n<li>is a custom metric<\/li>\n<\/ul>\n<ul>\n<li>has to be added manually to EC2 instances for tracking.<\/li>\n<\/ul>\n<\/li><li>2 types of Status Checks:\n<ul>\n<li>System Status Checks (Physical Host):\n<ul>\n<li>Checks the underlying physical host<\/li>\n<\/ul>\n<ul>\n<li>Checks for loss of network connectivity<\/li>\n<\/ul>\n<ul>\n<li>Checks for loss of system power<\/li>\n<\/ul>\n<ul>\n<li>Checks for software issues on the physical host<\/li>\n<\/ul>\n<ul>\n<li>Checks for hardware issues on the physical host<\/li>\n<\/ul>\n<ul>\n<li>Stop the instance and start again, for resolution (will switch physical hosts)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>Instance Status Checks\n<ul>\n<li>Checks the VM itself<\/li>\n<\/ul>\n<ul>\n<li>Checks for failed system status checks<\/li>\n<\/ul>\n<ul>\n<li>Checks for mis-configured networking or startup configs<\/li>\n<\/ul>\n<ul>\n<li>Checks for exhausted memory<\/li>\n<\/ul>\n<ul>\n<li>Checks for corrupted file systems<\/li>\n<\/ul>\n<ul>\n<li>Checks for an incompatible kernel<\/li>\n<\/ul>\n<ul>\n<li>rebooting instance or changing instance OS, for troubleshooting<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li><li>CloudWatch metrics are saved for 2 weeks only, by default<\/li><li>use GetMetricStatistics API endpoint to get data more than 2 weeks<\/li><li>Data from terminated EC2\/ ELB instance, after termination can be obtained up to 2 weeks<\/li><li>As per service the default metrics can be 1 min or 3-5 minutes<\/li><li>The minimum granularity for custom metrics is 1 minute<\/li><li>Alarms can be created to monitor any CloudWatch metric in account<\/li><li>Alarms can include EC2, CPU, ELB, Latency, or even changes on AWS bill<\/li><li>Following can be specified in a alarm\n<ul>\n<li>actions can be set<\/li>\n<\/ul>\n<ul>\n<li>triggering lambda functions or SNS notifications against a threshold<\/li>\n<\/ul>\n<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"550\" height=\"238\" src=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2019\/09\/image-130.png\" alt=\"\" class=\"wp-image-3694\"\/><\/figure>\n\n\n\n<p>Alarm has states<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>OK \u2013metric within threshold.<\/li><li>ALARM \u2013metric outside threshold.<\/li><li>INSUFFICIENT_DATA \u2013 indicates that alarm has initiated but metric is not accessible<\/li><\/ul>\n\n\n\n<p>Data point reported to CloudWatch classified as<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Not breaching (within the threshold)<\/li><li>Breaching (violating the threshold)<\/li><li>Missing<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"521\" height=\"400\" src=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2019\/09\/image-131-521x400.png\" alt=\"\" class=\"wp-image-3695\" srcset=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2019\/09\/image-131-521x400.png 521w, https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2019\/09\/image-131.png 591w\" sizes=\"auto, (max-width: 521px) 100vw, 521px\" \/><\/figure>\n\n\n\n<p>Missing data points&nbsp; against each alarm, can be treated as<\/p>\n\n\n\n<ul class=\"wp-block-list\">\r\n<li>notBreaching \u2013 Missing data points are treated as good and within the threshold,<\/li>\r\n<li>breaching \u2013data points are missing,\u00a0 considered as bad and assume to breach threshold<\/li>\r\n<li>ignore \u2013Present alarm state is held<\/li>\r\n<li>missing \u2013missing data points are not taken by the alarm, during the evaluation of changing the state<\/li>\r\n<\/ul>\r\n<p><strong>Become an <a href=\"https:\/\/www.testpreptraining.ai\/aws-certified-security-specialty-practice-exam\">AWS Certified Security &#8211; Specialty Professional<\/a> with hundreds of practice tests and expert guidance. Try Free Now!<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Watches a single metric over a specified time period, and performs specified actions, It initiates actions on behalf. An alarm can result in taking action on basis of metric value against a threshold over time period. Action can be notification to SNS or Auto Scaling policy. Can add alarms to dashboards. Actions only for sustained&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2474,"menu_order":13,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[7,403],"class_list":["post-3008","page","type-page","status-publish","hentry","category-amazon-aws","tag-aws","tag-cloudwatch-alarms"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Understanding CloudWatch Alarms - Testprep Training Tutorials<\/title>\n<meta name=\"description\" content=\"Upgrade your profile to become an AWS Certified Security - Specialty Professional with hundreds of practice tests and expert guidance. Take Test!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/cloudwatch-alarms-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Understanding CloudWatch Alarms - Testprep Training Tutorials\" \/>\n<meta property=\"og:description\" content=\"Upgrade your profile to become an AWS Certified Security - Specialty Professional with hundreds of practice tests and expert guidance. Take Test!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/cloudwatch-alarms-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Testprep Training Tutorials\" \/>\n<meta property=\"article:modified_time\" content=\"2020-05-01T11:08:57+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2019\/09\/image-130.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/cloudwatch-alarms-2\/\",\"url\":\"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/cloudwatch-alarms-2\/\",\"name\":\"Understanding CloudWatch Alarms - Testprep Training Tutorials\",\"isPartOf\":{\"@id\":\"https:\/\/www.testpreptraining.ai\/tutorial\/#website\"},\"datePublished\":\"2019-08-31T11:11:14+00:00\",\"dateModified\":\"2020-05-01T11:08:57+00:00\",\"description\":\"Upgrade your profile to become an AWS Certified Security - Specialty Professional with hundreds of practice tests and expert guidance. Take Test!\",\"breadcrumb\":{\"@id\":\"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/cloudwatch-alarms-2\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/cloudwatch-alarms-2\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/cloudwatch-alarms-2\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.testpreptraining.ai\/tutorial\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"AWS Certified Security Specialty\",\"item\":\"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Understanding CloudWatch Alarms\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.testpreptraining.ai\/tutorial\/#website\",\"url\":\"https:\/\/www.testpreptraining.ai\/tutorial\/\",\"name\":\"Testprep Training Tutorials\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/www.testpreptraining.ai\/tutorial\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.testpreptraining.ai\/tutorial\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.testpreptraining.ai\/tutorial\/#organization\",\"name\":\"Testprep Training\",\"url\":\"https:\/\/www.testpreptraining.ai\/tutorial\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.testpreptraining.ai\/tutorial\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/www.testpreptraining.com\/tutorial\/wp-content\/uploads\/2020\/07\/tpt-logo-6.png\",\"contentUrl\":\"https:\/\/www.testpreptraining.com\/tutorial\/wp-content\/uploads\/2020\/07\/tpt-logo-6.png\",\"width\":583,\"height\":153,\"caption\":\"Testprep Training\"},\"image\":{\"@id\":\"https:\/\/www.testpreptraining.ai\/tutorial\/#\/schema\/logo\/image\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Understanding CloudWatch Alarms - Testprep Training Tutorials","description":"Upgrade your profile to become an AWS Certified Security - Specialty Professional with hundreds of practice tests and expert guidance. Take Test!","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/cloudwatch-alarms-2\/","og_locale":"en_US","og_type":"article","og_title":"Understanding CloudWatch Alarms - Testprep Training Tutorials","og_description":"Upgrade your profile to become an AWS Certified Security - Specialty Professional with hundreds of practice tests and expert guidance. Take Test!","og_url":"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/cloudwatch-alarms-2\/","og_site_name":"Testprep Training Tutorials","article_modified_time":"2020-05-01T11:08:57+00:00","og_image":[{"url":"https:\/\/www.testpreptraining.ai\/tutorial\/wp-content\/uploads\/2019\/09\/image-130.png"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/cloudwatch-alarms-2\/","url":"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/cloudwatch-alarms-2\/","name":"Understanding CloudWatch Alarms - Testprep Training Tutorials","isPartOf":{"@id":"https:\/\/www.testpreptraining.ai\/tutorial\/#website"},"datePublished":"2019-08-31T11:11:14+00:00","dateModified":"2020-05-01T11:08:57+00:00","description":"Upgrade your profile to become an AWS Certified Security - Specialty Professional with hundreds of practice tests and expert guidance. Take Test!","breadcrumb":{"@id":"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/cloudwatch-alarms-2\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/cloudwatch-alarms-2\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/cloudwatch-alarms-2\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.testpreptraining.ai\/tutorial\/"},{"@type":"ListItem","position":2,"name":"AWS Certified Security Specialty","item":"https:\/\/www.testpreptraining.ai\/tutorial\/aws-certified-security-specialty\/"},{"@type":"ListItem","position":3,"name":"Understanding CloudWatch Alarms"}]},{"@type":"WebSite","@id":"https:\/\/www.testpreptraining.ai\/tutorial\/#website","url":"https:\/\/www.testpreptraining.ai\/tutorial\/","name":"Testprep Training Tutorials","description":"","publisher":{"@id":"https:\/\/www.testpreptraining.ai\/tutorial\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.testpreptraining.ai\/tutorial\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.testpreptraining.ai\/tutorial\/#organization","name":"Testprep Training","url":"https:\/\/www.testpreptraining.ai\/tutorial\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.testpreptraining.ai\/tutorial\/#\/schema\/logo\/image\/","url":"https:\/\/www.testpreptraining.com\/tutorial\/wp-content\/uploads\/2020\/07\/tpt-logo-6.png","contentUrl":"https:\/\/www.testpreptraining.com\/tutorial\/wp-content\/uploads\/2020\/07\/tpt-logo-6.png","width":583,"height":153,"caption":"Testprep Training"},"image":{"@id":"https:\/\/www.testpreptraining.ai\/tutorial\/#\/schema\/logo\/image\/"}}]}},"_links":{"self":[{"href":"https:\/\/www.testpreptraining.ai\/tutorial\/wp-json\/wp\/v2\/pages\/3008","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.testpreptraining.ai\/tutorial\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.testpreptraining.ai\/tutorial\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.testpreptraining.ai\/tutorial\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.testpreptraining.ai\/tutorial\/wp-json\/wp\/v2\/comments?post=3008"}],"version-history":[{"count":5,"href":"https:\/\/www.testpreptraining.ai\/tutorial\/wp-json\/wp\/v2\/pages\/3008\/revisions"}],"predecessor-version":[{"id":5131,"href":"https:\/\/www.testpreptraining.ai\/tutorial\/wp-json\/wp\/v2\/pages\/3008\/revisions\/5131"}],"up":[{"embeddable":true,"href":"https:\/\/www.testpreptraining.ai\/tutorial\/wp-json\/wp\/v2\/pages\/2474"}],"wp:attachment":[{"href":"https:\/\/www.testpreptraining.ai\/tutorial\/wp-json\/wp\/v2\/media?parent=3008"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.testpreptraining.ai\/tutorial\/wp-json\/wp\/v2\/categories?post=3008"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.testpreptraining.ai\/tutorial\/wp-json\/wp\/v2\/tags?post=3008"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}